Active metabolite of Morniflumate. At latest update, relevant information on excretion into breast milk was not found. Due to a high serum-protein-binding capacity, excretion of Rabeprazole into breast milk in significant levels is unlikely. Based on data offered by the manufacturer, excretion into breast milk is minimal, with a concentration in the milk which is one-hundredth less than plasma level. Nevertheless, it would be prudent the use of anti-inflammatory drugs known to be safe while breastfeeding.